Is there a difference between an Export brace off of a Boss 302 and a Boss 429? How do I identify what I have and are there dates etc.
First the term "export brace" is used to describe different parts to different people. For Ford the export brace was a one piece of steel that bridged from one shock tower to the other as well as to the firewall- cowl pinchweld. There was a secondary part used at that point to reinforce that attachment point
So have taken (incorrectly IMHO) to refer to the single (one per side) shock tower support brackets or panels that only bridged on shock tower to the firewall/cowl area of the car.
In using the term as identified above the Boss 302 originally didn't receive an export brace in 69 or 70 and the Boss 429 did.